Optical imaging system

Abstract

An optical imaging system according to an embodiment of this disclosure includes a first lens, a second lens, and a third lens arranged sequentially from the object side. In the optical imaging system according to this embodiment, the air gap between the first lens and the second lens is larger than the air gap between the second lens and the third lens. Furthermore, in the optical imaging system according to this embodiment, the first lens is formed of glass, and the length of the first lens in a first direction intersecting the optical axis is different from the length of the first lens in a second direction intersecting the optical axis.

Description

[Technical Field]

[0001] [Cross-reference to related applications]

[0002] This application claims priority to Korean Patent Application No. 10-2021-0044410 filed on April 6, 2021 and Korean Patent Application No. 10-2021-0072168 filed on June 3, 2021, both filed with the Korean Intellectual Property Office. The entire disclosure of the aforementioned Korean patent applications is incorporated herein by reference for all purposes.

[0003] This disclosure relates to an optical imaging system including a D-cut lens. [Previous Technology]

[0004] As the performance of cameras used in portable terminals gradually improves, the demand and necessity for optical imaging systems with high magnification (for telephoto imaging) are also increasing. However, since optical imaging systems with high magnification are quite large to achieve long focal lengths, they may be difficult to install in small portable terminals (especially thin terminals).

[0005] An optical imaging system including an optical path conversion tool (e.g., a prism) is considered as a method for solving the above-mentioned problems. As another method for solving the above-mentioned problems, an optical imaging system including a lens (referred to as a D-cut lens) in which one side surface and another side surface opposite to said one side surface are cut is being considered. According to the latter, the optical imaging system can reduce its size in the direction intersecting the optical axis (i.e., in the radial direction of the lens), and therefore can be applied to thin ends.

[0006] However, since D-cut lenses have different sizes in the horizontal direction (X-axis) and vertical direction (Y-axis) of the lens, the resolution or performance of the optical imaging system may be degraded. For example, in an optical imaging system that includes a D-cut lens, it may be difficult to ensure reliability regarding optical performance due to XY imbalance (the phenomenon of its deformation changes in the X-axis and Y-axis).

[0007] The above information is presented as background information only to help understand this disclosure. No determination or assertion is made as to whether any of the above content can be applied as prior art to this disclosure. [Summary of the Invention]

[0008] This summary is provided to introduce, in a simplified form, a series of concepts further elaborated in the embodiments below. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0009] In a general case, an optical imaging system includes: a first lens, a second lens and a third lens, arranged sequentially from the object side, wherein the first lens has a positive refractive power, wherein the Abbe number (V1) of the first lens is greater than 70, and wherein the distance (D12) from the object-side surface of the first lens to the image-side surface of the second lens is 2 mm or greater than 2 mm.

[0010] The Abbe number of the first lens may be greater than 70 and less than 96.

[0011] The following condition expression can be satisfied: 2.0 mm < D12 < 4.0 mm.

[0012] The focal length of the first lens may be greater than 8.0 mm and less than 16.0 mm.

[0013] The following condition expression can be satisfied: 1.5 < f / f1 < 3.0, where f is the focal length of the optical imaging system and f1 is the focal length of the first lens.

[0014] The following condition expression can be satisfied: 0 ≦ D12 / f ≦ 0.2, where f is the focal length of the optical imaging system.

[0015] The following conditional expression can be satisfied: 1.0 ≦ |f1 / f2| ≦ 3.0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0016] The following condition expression can be satisfied: 90 < V1 + V2, where V2 is the Abbe number of the second lens.

[0017] The first lens may have an effective radius in a first direction intersecting the optical axis that is different from the effective radius in a second direction intersecting the optical axis.

[0018] The following condition expression can be satisfied: 0.5 < ARL1 < 1.0, where ARL1 is the ratio (L1Ry / L1Rx) between the effective radius (L1Ry, minimum effective radius) in the second direction and the effective radius (L1Rx, maximum effective radius) in the first direction.

[0019] The following condition expression can be satisfied: 1.3 ≦ Dmax1 / Dmax2 ≦ 2.0, where Dmax1 is the maximum effective radius of the first lens and Dmax2 is the maximum effective radius of the second lens.

[0020] The optical imaging system may further include an optical path conversion component disposed on the object side of the first lens.

[0021] The optical imaging system may further include a fourth lens or a fourth lens and a fifth lens arranged sequentially on the image side of the third lens.

[0022] In another general example, an optical imaging system includes: a plurality of lenses arranged sequentially from the object side with an air gap, wherein the first lens, which is closest to the object side among the plurality of lenses, has a positive refractive power, wherein the Abbe number of the first lens is greater than 70, and wherein the following condition is satisfied: 0.8 < TTL / f < 1.0, where TTL is the distance from the object-side surface of the first lens to the image plane, and f is the focal length of the optical imaging system.

[0023] The following condition expression can be satisfied: 48 < NminV - NmaxV < 76, where NminV is the Abbe number of the lens with the smallest refractive index among the plurality of lenses, and NmaxV is the Abbe number of the lens with the largest refractive index among the plurality of lenses.

[0024] The following condition expression can be satisfied: 8.0 mm < BFL < 18.0 mm, where BFL is the distance from the image-side surface of the last lens closest to the image plane among the plurality of lenses to the image plane.

[0025] The following condition expression can be satisfied: 0.5 < CT1 / D12 < 0.9, where CT1 is the thickness of the first lens at the center along the optical axis, and D12 is the distance from the image side surface of the first lens to the object side surface of the second lens among the plurality of lenses.

[0026] In another general example, an optical imaging system includes: a first lens disposed on the object side closest to sequentially arranged lenses, wherein the first lens includes a positive refractive power, an Abbe number (V1) greater than 70, and a D-cut shape in which the effective radius in a first direction intersecting the optical axis is different from the effective radius in a second direction intersecting the optical axis, and wherein two or more of the sequentially arranged lenses are disposed on the image side of the first lens.

[0027] Other features and characteristics will become apparent from reading the following detailed description, drawings and claims.

Implementation Method

[0029] In the following, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0030] The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various modifications, refinements, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not intended to limit the reader to the order of operations described herein, but as will become apparent upon understanding this disclosure, changes may be made except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0031] The features described herein may be implemented in various forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways of implementing the methods, apparatus, and / or systems described herein that will become apparent upon understanding this disclosure.

[0032] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "coupled to" another element, the element may be directly "on," directly "connected to," or directly "coupled to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, no other elements may be present in between.

[0033] The term "and / or" as used herein includes any combination of any one or more of the related listed items; similarly, "at least one of" includes any combination of any one or more of the related listed items.

[0034] Although terms such as "first," "second," and "third" may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish individual components, parts, regions, layers, or sections. Therefore, without departing from the teaching of the examples, the first component, part, region, layer, or section mentioned in the examples described herein may also be referred to as the second component, part, region, layer, or section.

[0035] For ease of explanation, spatially relative terms such as "above," "upper," "below," "lower," and similar terms may be used herein to describe the relationship of one element relative to another element shown in the figures. Such spatially relative terms are intended to encompass not only the orientation shown in the figures but also different orientations of the device during use or operation. For example, if the device in the figures is rotated, an element described as being "above" or "upper" relative to another element will now be described as being "below" or "lower" relative to that other element. Therefore, the term "above" encompasses both above and below orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein shall be interpreted accordingly.

[0036] The terminology used herein is for illustrative purposes only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles "a" and "the" are intended to include the plural form as well. The terms "comprises," "includes," and "has" indicate the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0037] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may change. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include shape changes that occur during manufacturing.

[0038] It should be noted that in this document, the term "may" (e.g., what an instance may include or implement) means that there is at least one instance that includes or implements such a feature, but not all instances are limited thereto.

[0039] As will be apparent upon understanding this disclosure, the features of the instances described herein can be combined in various ways. Furthermore, although the instances described herein have multiple configurations, other configurations are also possible, as will be apparent upon understanding this disclosure.

[0040] The effective aperture radius of the lens surface is the radius of the portion of the lens surface through which light actually passes, and is not necessarily the radius of the outer edge of the lens surface. The object-side surface and the image-side surface of the lens may have different effective aperture radii.

[0041] In other words, the effective aperture radius of the lens surface is the distance between the optical axis of the lens surface and the edge light rays passing through the lens surface in a direction perpendicular to the optical axis of the lens surface.

[0042] One aspect of this disclosure is intended to provide an optical imaging system configured to achieve miniaturization and thinness while ensuring reliability regarding optical performance.

[0043] Furthermore, in this specification, the first lens refers to the lens most adjacent to the object (or target), and the third, fourth, or fifth lens refers to the lens most adjacent to the imaging plane (or image sensor). In this specification, the units for radius of curvature, thickness, total track length (TTL) (the distance along the optical axis from the object-side surface of the first lens to the imaging plane), IMG HT (half the diagonal length of the imaging plane), and focal length are indicated in millimeters (mm). The thickness of the lens, the gap between lenses, and TTL refer to the distance of the lens along the optical axis. Furthermore, in the description of the lens shape, a configuration where one surface is convex indicates that the optical axis region of said surface is convex, and a configuration where one surface is concave indicates that the optical axis region of said surface is concave. Therefore, even when one surface of the lens is described as convex, the edge of the lens may be concave. Similarly, even when one surface of the lens is described as concave, the edge of the lens may be convex. In this specification, the image plane refers to the plane on which the lens focuses or a surface of the image sensor.

[0044] An optical imaging system may include an optical system comprising multiple lenses. For example, the optical system of the optical imaging system may include multiple lenses with refractive power. However, the optical imaging system is not limited to lenses with refractive power. For example, the optical imaging system may include a prism for refracting incident light and an aperture for adjusting the amount of light. In addition, the optical imaging system may include an infrared cutoff filter for blocking infrared light.

[0045] The lens may be formed of a material having a refractive index different from that of air. For example, the lens may be formed of plastic or glass. At least one of the lenses may have an aspherical shape. The aspherical surface of the lens may be expressed by Equation 1.

[0046] Equation 1

[0047] In Equation 1, c is the reciprocal of the radius of curvature of the corresponding lens, K is the conic constant, r is the distance from any point on the aspherical surface to the optical axis, A to H and J are aspherical surface constants, and Z (or SAG) is the height from a point on the aspherical surface to the vertex of the corresponding aspherical surface in the direction of the optical axis.

[0048] An optical imaging system according to an embodiment of this disclosure may include a plurality of lenses arranged sequentially from the object side. For example, the optical imaging system may include a first lens, a second lens, and a third lens arranged sequentially from the object side. The configuration of the optical imaging system is not limited to the first to third lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side. As another example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side.

[0049] An optical imaging system according to an embodiment may include a lens having a positive refractive power. For example, a first lens may have a positive refractive power. The optical imaging system may include a lens having an Abbe number of a significant order of magnitude. For example, the optical imaging system may include a lens having an Abbe number greater than 70. As a specific example, the Abbe number of the first lens in the optical imaging system may be greater than 70. In the optical imaging system, air gaps may be formed between the lenses. For example, the plurality of lenses arranged sequentially from the object side may be arranged so as not to contact adjacent lenses. In the optical imaging system, the air gap between the first lens and the second lens may be larger than the air gaps between other lenses. For example, the air gap between the first lens and the second lens (the distance from the image-side surface of the first lens to the object-side surface of the second lens) may be greater than 2.0 mm.

[0050] An optical imaging system according to another embodiment of this disclosure may include a plurality of lenses arranged sequentially from the object side. For example, the optical imaging system may include a first lens, a second lens, and a third lens arranged sequentially from the object side. The configuration of the optical imaging system is not limited to the first to third lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side. As another example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side.

[0051] An optical imaging system according to another embodiment of this disclosure may include a lens having a positive refractive power. For example, a first lens may have a positive refractive power. Alternatively, the optical imaging system may include a lens having a negative refractive power. For example, a second lens may have a negative refractive power. The optical imaging system may include a lens in which the object-side surface is concave. For example, the object-side surface of the second lens may be concave.

[0052] An optical imaging system according to this specification may include lenses made of different materials. For example, the optical imaging system may include lenses made of glass and lenses made of plastic. Lenses made of glass may have a larger Abbe number than lenses made of other materials. For example, lenses made of glass may have an Abbe number of 70 or greater. Lenses made of glass may be configured such that their length (or effective radius) in a first direction intersecting the optical axis is different from their length (or effective radius) in a second direction intersecting the optical axis. For example, lenses made of glass may be manufactured in a form in which at least one side surface is cut (D-cut shape). Lenses made of glass may be configured to have a predetermined refractive power. For example, lenses made of glass may have a positive refractive power. Lenses made of glass may be positioned closest to the object side. For example, a first lens may be made of glass.

[0053] An optical imaging system according to this specification may include only a D-cut lens. For example, as described above, the optical imaging system may be configured with only a first lens formed of glass material in a D-cut shape, with the first lens positioned closest to the object side. Therefore, the optical imaging system according to this specification can minimize the optical performance degradation problem caused by the XY imbalance of the D-cut lens.

[0054] An optical imaging system according to this specification can be configured such that an air gap is formed between a first lens and a second lens. For example, the air gap between the first lens and the second lens (the distance from the image-side surface of the first lens to the object-side surface of the second lens) can be 2.0 mm or greater. As another example, the air gap between the first lens and the second lens can be larger than the air gap between other lenses.

[0055] The above-mentioned limiting conditions can reduce the effective radius of the lens disposed on the image side surface of the first lens, and can minimize the influence of the XY imbalance of the first lens on the second lens.

[0056] The optical imaging system can satisfy one or more of the following conditional expressions: 0 mm < f1 70 < V1 2 mm < D12 0.5 mm < ARL1 < 1.0 mm 1.5 < f / f1 < 3.0 0 ≦ D12 / f ≦ 0.2 1.3 ≦ Dmax1 / Dmax2 ≦ 2.0 1.0 ≦ |f1 / f2| ≦ 3.0 90 < V1+V2.

[0057] In the above conditional expressions, f is the focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, D12 is the distance from the object-side surface of the first lens to the image-side surface of the second lens, ARL1 is the ratio (L1Ry / L1Rx) between the effective radius (L1Rx, or maximum effective radius) of the first lens in the major axis direction and the effective radius (L1Ry, or minimum effective radius) of the first lens in the minor axis direction, Dmax1 is the maximum effective radius of the first lens, and Dmax2 is the maximum effective radius of the second lens.

[0058] In addition, the optical imaging system may satisfy one or more of the following conditional expressions: 8.0 mm < f1 < 16 mm 70 < V1 < 96 2.0 mm < D12 < 4.0 mm 0.10 ≦ D12 / f ≦ 0.20 90 < V1+V2 < 120 0.3 < BFL / TTL < 0.7 8.0 mm < BFL < 18.0 mm 0.5 < CT1 / D12 < 0.9 48 < NminV-NmaxV < 76 43 < V1 / Nd1 < 65 10 < V2 / Nd2 < 38 10 < V3 / Nd3 < 38 0.8 < TTL / f < 1.0.

[0059] In the above conditional expressions, BFL is the distance from the image-side surface of the lens closest to the image plane to the image plane, TTL is the distance from the object-side surface of the first lens to the image plane, CT1 is the thickness of the first lens at the center along the optical axis, NminV is the Abbe number of the lens with the minimum refractive index, NmaxV is the Abbe number of the lens with the maximum refractive index, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens.

[0060] In the following, embodiments of the present disclosure will be described in detail based on the accompanying illustrative drawings.

[0061] First, the optical imaging system according to the first embodiment will be described with reference to FIG1.

[0062] The optical imaging system 100 may include a first lens 110, a second lens 120, a third lens 130, and a fourth lens 140 arranged sequentially from the object side. The first lens 110 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The second lens 120 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The third lens 130 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The fourth lens 140 may have a negative refractive power and may have a shape in which the object-side surface is convex and the image-side surface is concave.

[0063] The optical imaging system 100 may include lenses formed of plastic material and lenses formed of glass material. For example, the first lens 110 may be formed of glass material, and the remaining lenses may be formed of plastic material.

[0064] The optical imaging system 100 may further include a filter IF and an image plane IP.

[0065] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0066] Table 1 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 2 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0067] Table 1 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 5.5081 2.005 1.497 81.6 3.0 2.2 3 -310.2280 2.985 2.8 2.2 4 Second lens -5.5588 0.890 1.639 23.5 1.9 5 6.9643 0.640 1.8 6 Third lens 11.5227 0.970 1.661 20.4 1.9 7 -11.3370 0.394 1.9 8 Fourth lens 13.3793 0.750 1.544 56.0 1.8 9 11.8607 5.000 1.8 10 Filter infinity 0.210 1.518 64.2 2.1 11 infinity 10.286 2.1 12 Image plane infinity 0.003 2.9

[0068] Table 2 Surface number 2 3 4 5 6 7 8 9 K 0.000E+00 0.000E+00 -9.528E-01 -3.10E+00 0.000E+00 0.000E+00 4.005E-01 7.832E-01 A 0.000E+00 0.000E+00 3.277E-04 1.950E-04 -1.157E-03 -1.357E-03 -3.300E-03 -1.519E-03 B 0.000E+00 0.000E+00 1.257E-04 7.398E-04 1.511E-03 7.943E-04 -6.406E-04 -4.171E-04 C 0.000E+00 0.000E+00 1.648E-05 -1.509E-04 -8.219E-04 -5.222E-04 2.869E-05 -2.190E-04 D 0.000E+00 0.000E+00 -1.073E-05 4.045E-06 3.815E-04 3.042E-04 5.377E-06 1.371E-04 E 0.000E+00 0.000E+00 1.437E-06 4.971E-06 -1.246E-04 -1.192E-04 3.333E-06 -2.483E-05 F 0.000E+00 0.000E+00 0.000E+00 -4.709E-07 2.304E-05 2.593E-05 -7.272E-07 -6.995E-07 G 0.000E+00 0.000E+00 0.000E+00 5.484E-08 -1.198E-06 -1.968E-06 -2.002E-07 3.776E-07 H 0.000E+00 0.000E+00 0.000E+00 0.000E+00 -1.720E-07 -1.401E-07 1.310E-07 1.273E-07 J 0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.959E-08 2.531E-08 -1.540E-08 -2.443E-08

[0069] The optical imaging system according to the second embodiment will be described with reference to FIG3.

[0070] The optical imaging system 200 may include a first lens 210, a second lens 220, and a third lens 230 arranged sequentially from the object side. The first lens 210 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is concave. The second lens 220 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The third lens 230 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex.

[0071] The optical imaging system 200 may include lenses formed of plastic material and lenses formed of glass material. For example, the first lens 210 may be formed of glass material, and the remaining lenses may be formed of plastic material.

[0072] The optical imaging system 200 may further include a filter IF and an image plane IP.

[0073] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0074] Table 3 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 4 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0075] Table 3 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 5.2024 2.000 1.459 90.2 3.0 2.1 3 48.6076 3.147 2.8 2.1 4 Second lens -45.2111 0.873 1.639 23.5 1.9 5 3.8985 0.627 1.8 6 Third lens 23.0942 0.820 1.661 20.4 1.8 7 -8.9267 0.435 1.9 8 Filter infinity 0.110 1.518 64.2 1.9 9 infinity 16.091 1.9 10 Image plane infinity -0.003 2.9

[0076] Table 4 Surface number 2 3 4 5 6 7 K 0.000E+00 0.000E+00 0.000E+00 2.509E+00 2.355E+01 2.794E-01 A 0.000E+00 0.000E+00 -7.811E-03 -1.064E-02 9.035E-04 -1.896E-03 B 0.000E+00 0.000E+00 7.713E-04 4.821E-04 7.809E-04 5.057E-04 C 0.000E+00 0.000E+00 -2.147E-05 -2.791E-04 -7.714E-04 -6.543E-04 D 0.000E+00 0.000E+00 -1.754E-05 -1.808E-05 3.735E-04 3.166E-04 E 0.000E+00 0.000E+00 2.741E-06 2.871E-06 -1.320E-04 -1.165E-04 F 0.000E+00 0.000E+00 9.233E-07 -1.943E-06 2.241E-05 2.455E-05 G 0.000E+00 0.000E+00 -1.510E-07 -3.862E-07 -7.071E-07 -2.582E-06 H 0.000E+00 0.000E+00 -6.197E-08 1.904E-07 -2.663E-07 -1.449E-08 J 0.000E+00 0.000E+00 1.164E-08 -6.499E-08 -6.562E-09 1.228E-08

[0077] The optical imaging system according to the third embodiment will be described with reference to FIG5.

[0078] The optical imaging system 300 may include a first lens 310, a second lens 320, a third lens 330, and a fourth lens 340 arranged sequentially from the object side. The first lens 310 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The second lens 320 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The third lens 330 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The fourth lens 340 may have a positive refractive power and may have a shape in which the object-side surface is concave and the image-side surface is convex.

[0079] The optical imaging system 300 may include lenses formed of plastic material and lenses formed of glass material. For example, the first lens 310 may be formed of glass material, and the remaining lenses may be formed of plastic material.

[0080] The optical imaging system 300 may further include a filter IF and an image plane IP.

[0081] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0082] Table 5 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 6 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0083] Table 5 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 5.0260 1.982 1.497 81.6 3.2 2.2 3 -594.7929 3.210 3.0 2.2 4 Second lens -12.2767 0.841 1.650 21.5 1.8 5 3.7447 1.573 1.6 6 Third lens 11.8280 0.694 1.661 20.4 1.8 7 -16.2362 0.282 1.8 8 Fourth lens -13.2916 1.069 1.535 55.7 1.8 9 -11.2048 5.000 1.8 10 Filter infinity 0.210 1.518 64.2 2.1 11 infinity 8.903 2.1 12 Image plane infinity 0.000 2.8

[0084] Table 6 Surface number 2 3 4 5 6 7 8 9 K 4.93E-01 0.00E+00 7.57E+00 6.33E-01 -1.62E+01 4.29E+00 -9.50E-01 4.97E+00 A -5.04E-04 -1.69E-04 -1.42E-03 -3.84E-03 2.35E-03 1.95E-03 3.86E-04 -7.81E-04 B 3.24E-05 6.42E-04 1.92E-03 2.46E-03 5.25E-04 4.99E-06 4.19E-04 4.70E-04 C -3.09E-06 -2.02E-04 -1.07E-03 -1.13E-03 -8.00E-04 -5.71E-04 7.75E-05 8.21E-05 D -3.71E-07 3.49E-05 3.00E-04 3.76E-04 4.19E-04 3.75E-04 2.28E-05 -6.06E-07 E -1.58E-08 -3.30E-06 -3.80E-05 -5.43E-05 -1.30E-04 -1.40E-04 2.91E-06 -8.33E-07 F 1.15E-08 1.56E-07 1.60E-06 -5.02E-06 2.06E-05 3.03E-05 -4.89E-07 2.22E-07 G -6.03E-10 -2.67E-09 -6.41E-07 -5.58E-07 -1.52E-06 -3.48E-06 -1.93E-07 1.20E-08 H -3.14E-11 -4.97E-12 -2.99E-08 4.41E-08 -2.40E-09 1.57E-07 -4.00E-08 -1.82E-08 J 1.86E-12 -8.67E-13 3.62E-08 1.37E-07 0.00E+00 -1.40E-08 2.46E-09 1.94E-10

[0085] An optical imaging system according to the fourth embodiment will be described with reference to FIG7.

[0086] The optical imaging system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450 arranged sequentially from the object side. The first lens 410 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is concave. The second lens 420 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The third lens 430 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The fourth lens 440 may have a positive refractive power and may have a shape in which the object-side surface is concave and the image-side surface is convex. The fifth lens 450 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is convex.

[0087] The optical imaging system 400 may include lenses formed of plastic material and lenses formed of glass material. For example, the first lens 410 may be formed of glass material, and the remaining lenses may be formed of plastic material.

[0088] The optical imaging system 400 may further include a filter IF and an image plane IP.

[0089] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0090] Table 7 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 8 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0091] Table 7 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 4.7768 2.000 1.497 81.6 3.0 2.3 3 34.5280 2.870 2.7 2.3 4 Second lens -8.0313 1.322 1.639 23.5 1.9 5 15.0265 0.500 1.7 6 Third lens -30.1374 1.000 1.544 56.0 1.7 7 55.3761 1.044 1.7 8 Fourth lens -89.2355 0.800 1.661 20.4 1.8 9 -9.2015 0.139 1.7 10 Fifth lens -13.8374 1.000 1.535 55.7 1.7 11 -15.4629 10.000 1.8 12 Filter infinity 0.210 1.518 64.2 2.3 13 infinity 3.975 2.3 14 Image plane infinity 0.008 2.6

[0092] Table 8 Surface number 2 3 4 5 6 K 0.00E+00 0.00E+00 3.28E+00 1.04E+01 8.71E+00 A 0.00E+00 0.00E+00 6.71E-04 -6.01E-04 -4.20E-05 B 0.00E+00 0.00E+00 7.14E-05 6.67E-04 1.35E-05 C 0.00E+00 0.00E+00 2.56E-05 -2.28E-05 3.84E-06 D 0.00E+00 0.00E+00 3.37E-06 2.86E-06 3.28E-08 E 0.00E+00 0.00E+00 -6.74E-07 4.38E-06 -1.37E-08 F 0.00E+00 0.00E+00 -1.65E-07 1.09E-06 -4.37E-08 G 0.00E+00 0.00E+00 2.56E-08 -2.43E-07 0.00E+00 H 0.00E+00 0.00E+00 -4.41E-09 -2.36E-07 0.00E+00 J 0.00E+00 0.00E+00 5.40E-10 4.27E-08 0.00E+00 Surface number 7 8 9 10 11 K -6.10E+01 0.00E+00 1.88E+01 4.56E+01 0.00E+00 A -4.18E-05 -2.06E-03 -5.19E-04 -1.12E-02 -8.87E-03 B 1.42E-05 2.82E-03 1.80E-03 -3.82E-04 4.61E-04 C 3.39E-06 -9.11E-04 -7.19E-05 4.70E-04 -5.30E-04 D 6.46E-07 4.60E-04 3.02E-04 -8.75E-05 2.23E-04 E -1.66E-07 -1.16E-04 -1.37E-04 1.50E-05 -2.67E-05 F -4.15E-08 1.66E-05 3.02E-05 -5.86E-06 -5.36E-06 G 0.00E+00 -6.94E-07 -2.02E-06 -4.42E-07 9.39E-07 H 0.00E+00 -1.22E-07 -8.31E-08 4.68E-07 1.55E-07 J 0.00E+00 7.56E-09 2.39E-08 -1.05E-08 -2.65E-08

[0093] The optical imaging system according to the fifth embodiment will be described with reference to FIG9.

[0094] The optical imaging system 500 may include a first lens 510, a second lens 520, and a third lens 530 arranged sequentially from the object side. The first lens 510 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The second lens 520 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is convex. The third lens 530 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex.

[0095] The optical imaging system 500 may include lenses formed of plastic material and lenses formed of glass material. For example, a first lens 510 may be formed of glass material, and the other lenses may be formed of plastic material.

[0096] The optical imaging system 500 may further include an IF filter and an image plane IP.

[0097] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0098] Table 9 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 10 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0099] Table 9 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 6.8430 2.646 1.459 90.2 3.0 2.4 3 -82.1055 3.752 2.7 2.4 4 Second lens -4.9166 1.155 1.639 23.5 1.9 5 -49.5389 0.343 2.0 6 Third lens 112.7187 1.323 1.661 20.4 2.0 7 -11.2769 0.575 2.0 8 Filter infinity 0.210 1.518 64.2 1.9 9 infinity 14.496 2.0 10 Image plane infinity 0.000 2.9

[0100] Table 10 Surface number 2 3 4 5 6 7 K 0.000E+00 0.000E+00 2.139E+00 0.000E+00 0.000E+00 -1.93E+01 A 0.000E+00 0.000E+00 4.117E-03 -2.629E-04 8.107E-04 3.976E-04 B 0.000E+00 0.000E+00 2.203E-04 -1.703E-05 1.663E-04 2.564E-04 C 0.000E+00 0.000E+00 4.423E-05 1.888E-05 -1.091E-04 -8.718E-05 D 0.000E+00 0.000E+00 -1.226E-06 1.990E-06 3.540E-05 2.624E-05 E 0.000E+00 0.000E+00 -3.830E-07 1.631E-07 -4.746E-06 -4.965E-06 F 0.000E+00 0.000E+00 1.320E-07 1.137E-07 8.162E-07 7.533E-07 G 0.000E+00 0.000E+00 2.687E-08 7.319E-08 -3.187E-09 -3.884E-08 H 0.000E+00 0.000E+00 -1.996E-09 0.000E+00 -2.132E-09 1.293E-10 J 0.000E+00 0.000E+00 4.672E-10 0.000E+00 -8.327E-11 4.167E-11

[0101] The optical imaging system according to the sixth embodiment will be described with reference to FIG11.

[0102] The optical imaging system 600 may include a first lens 610, a second lens 620, and a third lens 630 arranged sequentially from the object side. The first lens 610 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The second lens 620 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The third lens 630 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex.

[0103] The optical imaging system 600 may include lenses formed of plastic material and lenses formed of glass material. For example, the first lens 610 may be formed of glass material, and the remaining lenses may be formed of plastic material.

[0104] The optical imaging system 600 may further include an IF filter and an image plane IP.

[0105] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0106] Table 11 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 12 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0107] Table 11 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 6.6210 2.646 1.487 70.4 3.0 2.0 3 -30.5636 3.146 2.7 2.0 4 Second lens -5.4199 1.155 1.639 23.5 2.0 5 13.5840 1.091 1.9 6 Third lens 28.0795 1.323 1.661 20.4 2.0 7 -11.8054 0.575 2.0 8 Filter infinity 0.210 1.518 64.2 2.0 9 infinity 15.187 2.0 10 Image plane infinity 0.000 2.9

[0108] Table 12 Surface number 2 3 4 5 6 7 K 0.000E+00 0.000E+00 1.943E+00 0.000E+00 0.000E+00 -6.62E+00 A -3.585E-05 1.423E-04 5.415E-03 2.062E-03 -4.541E-04 -2.285E-04 B 4.347E-07 9.174E-06 1.034E-04 1.651E-04 2.930E-04 1.630E-04 C 1.068E-07 1.754E-07 2.831E-05 3.966E-05 -8.245E-05 -7.753E-05 D 9.851E-09 -7.300E-09 -1.106E-06 6.346E-06 3.775E-05 2.877E-05 E 2.089E-10 -5.664E-10 4.297E-08 5.052E-07 -4.889E-06 -4.739E-06 F -3.781E-11 -1.538E-11 1.091E-07 3.101E-08 6.676E-07 7.175E-07 G -4.293E-12 3.128E-11 -3.164E-08 -1.994E-08 -6.085E-08 -5.345E-08 H -5.507E-15 1.755E-12 6.134E-10 0.000E+00 1.273E-10 -7.297E-11 J 7.087E-14 -1.071E-13 4.672E-10 0.000E+00 -8.327E-11 4.167E-11

[0109] The optical imaging system according to the seventh embodiment will be described with reference to FIG13.

[0110] The optical imaging system 700 may include a first lens 710, a second lens 720, a third lens 730, and a fourth lens 740 arranged sequentially from the object side. The first lens 710 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The second lens 720 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The third lens 730 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The fourth lens 740 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave.

[0111] The optical imaging system 700 may include lenses formed of plastic material and lenses formed of glass material. For example, the first lens 710 may be formed of glass material, and the remaining lenses may be formed of plastic material.

[0112] The optical imaging system 700 may further include an IF filter and an image plane IP.

[0113] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0114] Table 13 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 14 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0115] Table 13 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 5.3995 2.005 1.497 81.6 3.0 2.3 3 -300.7225 2.837 2.8 2.3 4 Second lens -7.3685 0.890 1.671 19.4 1.9 5 6.6287 0.835 1.8 6 Third lens 10.5231 0.970 1.535 56.1 1.8 7 -7.1894 0.150 1.9 8 Fourth lens -12.7341 0.800 1.671 19.4 2.0 9 34.8754 5.000 2.0 10 Filter infinity 0.110 1.518 64.2 2.3 11 infinity 10.057 2.3 12 Image plane infinity 0.002 2.9

[0116] Table 14 Surface number 2 3 4 5 6 7 8 9 K 0.00E+00 0.00E+00 -2.18E-01 -7.72E-01 0.00E+00 0.00E+00 -1.72E+01 1.07E+02 A 0.00E+00 0.00E+00 5.40E-06 1.25E-03 -1.94E-03 -1.88E-03 8.50E-04 2.05E-03 B 0.00E+00 0.00E+00 1.12E-04 7.44E-04 1.12E-03 7.37E-04 1.34E-04 1.13E-04 C 0.00E+00 0.00E+00 -2.63E-05 -1.57E-04 -8.07E-04 -6.00E-04 4.28E-06 -2.26E-04 D 0.00E+00 0.00E+00 2.28E-07 3.03E-06 3.70E-04 3.06E-04 -8.53E-07 1.40E-04 E 0.00E+00 0.00E+00 3.25E-07 4.14E-07 -1.28E-04 -1.19E-04 -4.40E-07 -3.00E-05 F 0.00E+00 0.00E+00 0.00E+00 1.77E-07 2.27E-05 2.53E-05 -1.18E-07 -2.01E-06 G 0.00E+00 0.00E+00 0.00E+00 3.02E-08 -1.16E-06 -2.08E-06 3.18E-08 1.01E-06 H 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.78E-07 -1.23E-07 4.20E-09 1.12E-07 J 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2.10E-08 2.50E-08 -5.47E-11 -3.45E-08

[0117] The optical imaging system according to the eighth embodiment will be described with reference to FIG15.

[0118] The optical imaging system 800 may include a first lens 810, a second lens 820, a third lens 830, and a fourth lens 840 arranged sequentially from the object side. The first lens 810 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The second lens 820 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The third lens 830 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The fourth lens 840 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex.

[0119] The optical imaging system 800 may include lenses formed of plastic material and lenses formed of glass material. For example, the first lens 810 may be formed of glass material, and the remaining lenses may be formed of plastic material.

[0120] The optical imaging system 800 may further include an IF filter and an image plane IP.

[0121] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0122] Table 15 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 16 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0123] Table 15 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 5.3995 2.005 1.497 81.6 3.0 2.0 3 -300.7225 2.837 2.8 2.0 4 Second lens -7.3685 0.890 1.639 23.5 1.9 5 6.6287 0.835 1.8 6 Third lens -34.8754 0.800 1.635 23.9 1.8 7 12.7341 0.150 1.9 8 Fourth lens 7.1894 0.970 1.661 20.4 2.0 9 -10.5231 5.000 2.0 10 Filter infinity 0.110 1.518 64.2 2.3 11 infinity 11.091 2.3 12 Image plane infinity 0.002 2.9

[0124] Table 16 Surface number 2 3 4 5 6 7 8 9 K 0.00E+00 0.00E+00 -2.18E-01 -7.72E-01 0.00E+00 -1.72E+01 0.00E+00 0.00E+00 A 0.00E+00 0.00E+00 5.40E-06 4.70E-04 -3.89E-03 -1.24E-02 -7.56E-03 1.94E-03 B 0.00E+00 0.00E+00 1.12E-04 5.66E-04 -4.30E-04 -4.20E-03 -5.72E-03 -1.12E-03 C 0.00E+00 0.00E+00 -2.63E-05 -2.15E-04 1.49E-04 3.43E-03 5.84E-03 8.07E-04 D 0.00E+00 0.00E+00 2.28E-07 -9.60E-06 -1.52E-04 -8.86E-04 -2.84E-03 -3.70E-04 E 0.00E+00 0.00E+00 3.25E-07 -1.94E-07 2.89E-05 -1.40E-04 7.96E-04 1.28E-04 F 0.00E+00 0.00E+00 0.00E+00 1.99E-07 1.67E-06 1.71E-04 -7.15E-05 -2.27E-05 G 0.00E+00 0.00E+00 0.00E+00 -5.02E-08 -1.23E-06 -4.44E-05 -1.78E-05 1.16E-06 H 0.00E+00 0.00E+00 0.00E+00 -1.25E-17 -1.12E-07 3.88E-06 4.67E-06 1.78E-07 J 0.00E+00 0.00E+00 0.00E+00 -3.92E-19 3.45E-08 5.47E-11 -2.99E-07 -2.10E-08

[0125] An optical imaging system according to the ninth embodiment will be described with reference to FIG17.

[0126] The optical imaging system 900 may include a first lens 910, a second lens 920, a third lens 930, and a fourth lens 940 arranged sequentially from the object side. The first lens 910 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is concave. The second lens 920 may have a negative refractive power and may have a shape in which the object-side surface is concave and the image-side surface is concave. The third lens 930 may have a positive refractive power and may have a shape in which the object-side surface is convex and the image-side surface is convex. The fourth lens 940 may have a negative refractive power and may have a shape in which the object-side surface is convex and the image-side surface is concave.

[0127] The optical imaging system 900 may include lenses formed of plastic material and lenses formed of glass material. For example, the first lens 910 may be formed of glass material, and the remaining lenses may be formed of plastic material.

[0128] The optical imaging system 900 may further include an IF filter and an image plane IP.

[0129] A filter IF may be disposed in front of the image plane IP to block infrared radiation included in the incident light. The image plane IP provides space for imaging the light refracted by the lens. The image plane IP may be formed on the image sensor IS. For example, the image plane IP may be formed on one surface of the image sensor IS. The image plane IP may not necessarily be formed on the image sensor IS. For example, the image plane IP may be formed on any type of component or device capable of converging optical signals (e.g., an image film or the like).

[0130] Table 17 shows the properties of the lens of the optical imaging system according to this embodiment, and Table 18 shows the aspherical surface values ​​of the optical imaging system according to this embodiment.

[0131] Table 17 Surface number Components radius of curvature Thickness / Distance Refractive index Abbe number Effective radius (major axis radius) minor axis radius 1 infinity 0.000 2 First lens 5.3597 1.930 1.497 81.6 3.0 2.2 3 334.1444 3.247 2.8 2.2 4 Second lens -7.8458 0.800 1.639 23.5 1.9 5 5.7002 0.552 1.8 6 Third lens 11.5227 0.970 1.661 20.4 1.9 7 -11.3370 0.394 1.9 8 Fourth lens 13.3793 0.750 1.544 56.0 1.8 9 11.8607 5.000 1.8 10 Filter infinity 0.210 1.518 64.2 2.1 11 infinity 10.275 2.1 12 Image plane infinity 0.005 2.9

[0132] Table 18 Surface number 2 3 4 5 6 7 8 9 K 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E-01 7.83E-01 A 0.00E+00 0.00E+00 -5.01E-03 -6.64E-03 -1.16E-03 -1.36E-03 -3.30E-03 -1.52E-03 B 0.00E+00 0.00E+00 7.89E-04 1.50E-03 1.51E-03 7.94E-04 -6.41E-04 -4.17E-04 C 0.00E+00 0.00E+00 9.71E-05 -1.50E-04 -8.22E-04 -5.22E-04 2.87E-05 -2.19E-04 D 0.00E+00 0.00E+00 -7.19E-05 -1.74E-05 3.82E-04 3.04E-04 5.38E-06 1.37E-04 E 0.00E+00 0.00E+00 1.33E-05 6.09E-06 -1.25E-04 -1.19E-04 3.33E-06 -2.48E-05 F 0.00E+00 0.00E+00 -8.27E-07 0.00E+00 2.30E-05 2.59E-05 -7.27E-07 -7.00E-07 G 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.20E-06 -1.97E-06 -2.00E-07 3.78E-07 H 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.72E-07 -1.40E-07 1.31E-07 1.27E-07 J 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1.96E-08 2.53E-08 -1.54E-08 -2.44E-08

[0133] Tables 19 and 20 show the optical characteristic values ​​of the optical imaging system according to the first to ninth embodiments. For reference, in Table 18, ih is the diagonal length of the upper surface.

[0134] Table 19 First Implementation Example Second Implementation Example Third Implementation Example Fourth Implementation Fifth Implementation f 27.200 27.200 27,000 27,000 25,000 f1 10.912 12.511 10.039 10.911 13.891 f2 -4.707 -5.578 -4.325 -8.012 -8.629 f3 8.794 9.840 10.455 -35.728 15.575 f4 -232.555 - 113.181 15.459 - f5 - - - -313.183 - TTL 24.133 24.100 23.765 24.867 24.500 ih 5.800 5.800 5.540 5.120 5.800 BFL 10.289 16.632 8.903 15.331 15.281 Sixth Implementation Seventh Implementation Eighth Implementation Ninth Implementation f 27,000 27.200 25.800 27.200 f1 11.441 10.696 10.696 10.939 f2 -5.922 -5.068 -5.329 -5.050 f3 12.742 8.139 -14.595 8.794 f4 - -13.800 6.606 -232.555 f5 - - - - TTL 25.333 23.657 24.691 24.133 ih 5.800 5.800 5.800 5.800 BFL 15.972 10.059 11.093 10.280

[0135] Tables 20 and 21 show the conditional expression values ​​of the optical imaging system according to the first to ninth embodiments.

[0136] Table 20 Conditional expressions First Implementation Example Second Implementation Example Third Implementation Example Fourth embodiment Fifth embodiment f1 10.912 12.511 10.039 10.911 13.891 V1 81.600 90.200 81.600 81.600 90.200 D12 2.985 3.147 3.210 2.870 3.752 ARL1 0.733 0.700 0.683 0.767 0.800 BFL 10.289 16.632 8.903 15.331 15.281 f / f1 2.493 2.174 2.690 2.475 1.800 D12 / f 0.110 0.116 0.119 0.106 0.150 Dmax1 / Dmax2 1.579 1.579 1.781 1.586 1.549 |f1 / f2| 2.318 2.243 2.321 1.362 1.610 V1+V2 105,100 113,700 103.100 105,100 113,700 CT1 / D12 0.672 0.636 0.617 0.697 0.705 BFL / TTL 0.426 0.690 0.375 0.617 0.624 BFL / f 0.378 0.611 0.330 0.568 0.611 NminV-NmaxV 61,200 69,800 61,200 61,200 69,800 V1 / Nd1 54.509 61.823 54.509 54.509 61.823 V2 / Nd2 14.338 14.338 13,030 14.338 14.338 V3 / Nd3 12,282 12,282 12,282 36.269 12,282 TTL / f 0.8872 0.8860 0.8802 0.9210 0.9800

[0137] Table 21 conditional expression Sixth Embodiment Seventh Embodiment Eighth embodiment Ninth Embodiment f1 11.441 10.696 10.696 10.939 V1 70.400 81.600 81.600 81.600 D12 3.146 2.837 2.837 3.247 ARL1 0.667 0.767 0.667 0.733 BFL 15.972 10.059 11.093 10.280 f / f1 2.360 2.543 2.412 2.487 D12 / f 0.117 0.104 0.110 0.119 Dmax1 / Dmax2 1.533 1.579 1.579 1.579 |f1 / f2| 1.932 2.111 2.007 2.166 V1+V2 93.900 101,000 105,100 105,100 CT1 / D12 0.841 0.707 0.707 0.594 BFL / TTL 0.630 0.425 0.449 0.426 BFL / f 0.592 0.370 0.430 0.378 NminV-NmaxV 50,000 62,200 61,200 61,200 V1 / Nd1 47.344 54.509 54.509 54.509 V2 / Nd2 14.338 11.607 14.338 14.338 V3 / Nd3 12,282 36.547 14.618 12,282 TTL / f 0.9382 0.8697 0.9570 0.8872

[0138] The optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 according to the first to ninth embodiments may further include components such as the optical path conversion member shown in FIG19. For example, the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 may further include a prism P. The prism P may be disposed on the object side of the first lens. The arrangement of the prism P is not limited to the object side of the first lens.

[0139] The optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 according to the first to ninth embodiments may include D-cut lenses. For example, the first lenses 110, 210, 310, 410, 510, 610, 710, 810, and 910 of the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 according to the first to ninth embodiments may be configured such that their length L1Rx in a first direction intersecting the optical axis is different from their length L1Ry in a second direction intersecting the optical axis. More specifically, in the first lenses 110, 210, 310, 410, 510, 610, 710, 810, and 910, the length L1Rx in the first direction may be longer than the length L1Ry in the second direction.

[0140] This disclosure provides an optical imaging system that can improve the reliability of optical performance.

[0141] In addition, this disclosure provides an optical imaging system with high magnification.

[0142] Although specific exemplary embodiments have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are intended to be illustrative only and not for limiting purposes. The description of features or manner in each example is intended to be applicable to similar features or manner in other examples. Suitable results may be achieved if the described technology is performed in a different order, and / or if components in the described system, architecture, apparatus, or circuit are combined in a different manner and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not defined by the detailed description but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are intended to be included in this disclosure. [Simplified Explanation of the Diagram]

[0028] FIG1 is a configuration diagram of an optical imaging system according to a first embodiment. FIG2 is an aberration curve of the optical imaging system shown in FIG1. ​​FIG3 is a configuration diagram of an optical imaging system according to a second embodiment. FIG4 is an aberration curve of the optical imaging system shown in FIG3. FIG5 is a configuration diagram of an optical imaging system according to a third embodiment. FIG6 is an aberration curve of the optical imaging system shown in FIG5. FIG7 is a configuration diagram of an optical imaging system according to a fourth embodiment. FIG8 is an aberration curve of the optical imaging system shown in FIG7. FIG9 is a configuration diagram of an optical imaging system according to a fifth embodiment. FIG10 is an aberration curve of the optical imaging system shown in FIG9. FIG11 is a configuration diagram of an optical imaging system according to a sixth embodiment. FIG12 is an aberration curve of the optical imaging system shown in FIG11. FIG13 is a configuration diagram of an optical imaging system according to a seventh embodiment. FIG14 is an aberration curve of the optical imaging system shown in FIG13. FIG15 is a configuration diagram of an optical imaging system according to an eighth embodiment. FIG16 is an aberration curve of the optical imaging system shown in FIG15. FIG17 is a configuration diagram of an optical imaging system according to a ninth embodiment. FIG18 is an aberration curve of the optical imaging system shown in FIG17. Figure 19 is a configuration diagram of an optical imaging system according to another embodiment of this disclosure. Figure 20 is a plan view of a first lens constituting an optical imaging system according to the first to ninth embodiments. Throughout all figures and detailed descriptions, the same reference numerals refer to the same elements. The figures may not be drawn to scale, and for clarity, illustrative purposes, the relative sizes, proportions, and depictions of the elements in the figures may be exaggerated.

Claims

1. An optical imaging system, comprising: A first lens, a second lens, a third lens, and a fourth lens are arranged sequentially from the object side, wherein the first lens is the lens closest to the object side and has positive refractive power; wherein the object-side surface of the fourth lens is concave and the image-side surface of the fourth lens is convex; wherein the second lens is the lens closest to the image-side surface of the first lens; wherein the third lens is the lens closest to the image-side surface of the second lens; and wherein the fourth lens is the lens closest to the image-side surface of the third lens and has positive refractive power, wherein the following conditions are satisfied: 1.5 < f / f1 < 3.0 and 0 ≦ D12 / f ≦ 0.2, where f is the focal length of the optical imaging system, f1 is the focal length of the first lens, and D12 is the distance from the image-side surface of the first lens to the object-side surface of the second lens.

2. The optical imaging system as claimed in claim 1, wherein the following conditional expression is satisfied: 1.0 ≦ |f1 / f2| ≦ 3.0, where f2 is the focal length of the second lens.

3. The optical imaging system of claim 1, wherein the following conditional expression is satisfied: 0.3 < BFL / TTL < 0.7, where BFL is the distance from the image-side surface of the last lens closest to the image plane in the optical imaging system to the image plane, and TTL is the distance from the object-side surface of the first lens to the image plane.

4. The optical imaging system as claimed in claim 1, wherein the following condition is satisfied: 10 < V2 / Nd2 < 38, where V2 is the Abbe number of the second lens and Nd2 is the refractive index of the second lens.

5. The optical imaging system of claim 1, wherein the following condition is satisfied: 10 < V3 / Nd3 < 38, where V3 is the Abbe number of the third lens and Nd3 is the refractive index of the third lens.

6. The optical imaging system of claim 1, wherein the following condition is satisfied: 0.8 < TTL / f < 1.0, where TTL is the distance from the object-side surface of the first lens to the image plane.

7. The optical imaging system of claim 1, wherein the image-side surface of the second lens is concave.

8. The optical imaging system as claimed in claim 1, wherein the object-side surface of the third lens is convex.

9. The optical imaging system of claim 1, wherein the image-side surface of the third lens is convex.

10. The optical imaging system as claimed in claim 1, further comprising a fifth lens arranged sequentially on the image side of the fourth lens.

11. The optical imaging system of claim 10, wherein the object-side surface of the fifth lens is concave.

12. The optical imaging system of claim 10, wherein the image-side surface of the fifth lens is convex.

13. The optical imaging system as claimed in claim 1 further includes an optical path conversion member disposed on the object side of the first lens.

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